<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title></title>
</head>
<body>
	<script>
		// switch (expression) {
		// 	case label_1:
		// 		// statements_1
		// 		break;
		// 	default:
		// 		// statements_def
		// 		break;
		// }

		/*
		var age = 31;
		switch(age){
			case 18:
			console.log('成年了');
			break;
			case 26:
			console.log('成年了2');
			break;
			case 30:
			console.log('成年了3');
			break;
			default:
   		   console.log('很遗憾')
		}
		*/
		


	</script>
	
</body>
</html>